SANA’A, Yemen — Tens of thousands of Yemenis took to the streets to protest for and against President Ali Abdullah Saleh yesterday, after efforts to revive a plan for him to leave power were stymied by his party.

Saleh, in power for nearly 33 years, had appeared set to sign an exit deal, which guarantees him and his family and aides immunity from prosecution, but last week refused to sign the agreement.